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(FIA) Annual Inventory Answers the Question: What Is Happening to Pinyon-Juniper Woodlands?

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(FIA) Annual Inventory Answers the Question: What Is Happening to Pinyon-Juniper Woodlands? Forest Inventory and Analysis (FIA) Annual Inventory Answers the Question: What Is Happening to Pinyon-Juniper Woodlands? John D. Shaw, Brytten E. Steed, and Larry T. DeBlander Widespread mortality in the pinyon-juniper forest type is associated with several years of drought in Pinus monophylla Torr.&Frem.)—and one the southwestern United States. A complex of drought, insects, and disease is responsible for pinyon or more juniper species (Juniperus spp.); mortality rates approaching 100% in some areas, while other areas have experienced little or no pure stands of pinyon usually are not con- mortality. Implementation of the Forest Inventory and Analysis (FIA) annual inventory in several states sidered a separate type. Pinyon nuts were a coincided with the onset of elevated mortality rates. Adjunct inventories provided supplemental data on staple food for Native Americans of the damaging agents. Preliminary analysis reveals the status and trends of mortality in pinyon-juniper Southwest for thousands of years, and the woodlands. harvest of this valuable resource continues ABSTRACT today (Lanner 1981). There also are many Keywords: forest inventory, FIA, pinyon pines, pinyon-juniper woodlands, drought, mortality, Ips traditional and modern uses for pinyon and confusus, bark beetles, southwestern United States juniper wood. The extensive range and vol- ume of the resource has generated interest in intensive use, such as an energy-producing biomass crop. However, pinyon-juniper he Forest Inventory and Analysis same systematic sample grid as was used for woodland is seen as a weedy invader of pro- (FIA) is a national USDA Forest periodic inventories, but the plots are evenly ductive grasslands by some. T Service program that conducts for- divided into annual panels that are visited in The Interior West FIA (IW-FIA) pro- est inventory across all land ownerships in a continuous cycle. In western states, one- gram operates in Arizona, Colorado, Idaho, the United States. FIA inventories are based tenth of the plots in a state is sampled per Montana, Nevada, New Mexico, Utah, and on a systematic sample, establishing perma- year, producing a 10-year inventory cycle. Wyoming, which includes most of the range nent sample plots on the ground at an inten- Plots are distributed throughout the state in of the pinyon-juniper type in the United sity of approximately one plot per 6,000 for- each panel. Consequently, annual panels are States. Annual inventory was implemented ested acres. In the past, FIA conducted theoretically free from geographic bias. This in Utah in 2000 and in most of the other periodic inventories in which all plots in a system provides a continuous flow of data, IW-FIA states since then. About the time given state were measured at once. In west- which allows for more flexible analysis op- that annual inventory was started in the IW, ern states it commonly required several years tions and provides opportunities to monitor forest managers and researchers began to no- to measure all the plots in a state. The forest change in ways that were not possible tice an increase in the incidence of insects planned periodic revisitation cycle in the using periodic inventory data. and disease in several forest types, including western United States was 10 years, but ac- Pinyon-juniper woodland is the most pinyon-juniper. Much of the increase has tual cycle lengths sometimes approached 20 common forest type in the American South- been attributed to the drought that spread years. In response to user demand for more west, covering over 36 million acres in 10 across the Southwest beginning in the late timely information, FIA began to test and states and extending into Mexico. The type 1990s (Figure 1). implement an annual inventory system in is defined by the presence of one or more As of Jan. 2005, the drought was ongo- 1996 (Gillespie 1999). pinyon species—usually common and ing and significant drought-related mortal- The annual inventory system uses the singleleaf pinyon (Pinus edulis Engelm. and ity had occurred in the pinyon-juniper type 280 Journal of Forestry • September 2005 mortality. Therefore, the current mortality episode has provided an opportunity to test the usefulness of the FIA annual inventory system for quantifying rapid change in pin- yon-juniper woodlands over a large geo- graphic area (Shaw in press). Because of the high degree of interest in the amount of mortality and causal agents, we established an adjunct inventory on a subset of FIA inventory plots to document damaging agents in detail. Here, we describe the extent and severity of mortality in the pinyon-juniper forest type and highlight some of the contributing mortality agents. Drought and Effects on Forests The current Southwest drought began about 1998 (McPhee et al. 2004), but the exact time of onset varies by location and interpretation of climatic data. Although lo- Figure 1. Climate record from 1895 to 2004 for five southwestern states as recorded in the cally severe, the current drought appears Palmer Drought Severity Index (PDSI). Data points represent the mean annual PDSI for comparable in magnitude to droughts in the National Oceanic and Atmospheric Administration (NOAA) Climate Divisions within each early 1900s, in the 1950s, and during many state (National Climatic Data Center 1994). other dry periods that have been docu- mented using tree-ring–based reconstruc- tions of the past 800 years (Cole et al. 2004, McPhee et al. 2004; Figure 1). In recent months, it appears that some areas affected by drought since the late 1990s are experi- encing a degree of relief (Society of Ameri- can Foresters 2004). Anecdotal reports of drought-related effects on Southwest forests began in 2000, but a dramatic increase in tree mortality oc- curred in 2002 (Anhold and McMillin 2003). There were local reports of up to 100% mortality of the pinyon component in pinyon-juniper woodland. A rapid expan- sion of high-mortality areas was recorded during aerial surveys between the fall of 2002 and the fall of 2003 (Anhold and Mc- Millin 2003). Although locally severe, little of the observed mortality has been attrib- uted to drought alone. The cause of mortal- ity may be best described as a complex of drought, insects, and disease. Mortality Status and Trends Figure 2. Landscape-scale pinyon mortality in pinyon-juniper woodland in southeastern Data from IW-FIA periodic and annual Utah. (Photo by B. Steed.) inventories offer some insight into the pro- gression of drought-related mortality across (Figure 2). Widespread and locally severe was known to occur. Because the FIA sam- the Southwest. Periodic inventories from mortality has inspired efforts to quantify the ple is unbiased with respect to plot location Arizona, New Mexico, and Utah quantified effects of drought, insects, and disease over and covers a wide area and extended time predrought conditions of pinyon-juniper the past 5 years. Some of these efforts have period, it provides a unique view of pinyon- forests and more recent annual inventory been local in nature and lack the geographic juniper woodlands. The systematic sample data from Arizona, Colorado, Nevada, and and temporal ranges covered by the FIA pro- also reduces the likelihood of producing er- Utah captured the current drought-related gram. Other efforts provided wider coverage roneous conclusions that may come from mortality episode. Although junipers and but were focused on areas where mortality surveys conducted only in known areas of other species have suffered mortality in some Journal of Forestry • September 2005 281 areas, FIA plot data suggest that, to date, they are largely unaffected in the pinyon- juniper type. For the sake of simplicity, the figures and trends presented here represent only the pinyon component of the pinyon- juniper type. The IW-FIA program defines a mortal- ity tree as one determined to have died within 5 years of the plot measurement date. Therefore, a distinction between long- standing dead trees and recently killed trees is made in the field. In the case of periodic inventories, this distinction was necessary for the purpose of estimating annual mortal- ity because data were limited to initial plot measurements. In reports based on periodic data, observed mortality is averaged over the 5-year period and reported as annual mor- tality in the year before inventory. There- fore, using this method it is assumed that 5-year average mortality is representative of the reported year. Periodic inventory data suggest that annual mortality is relatively low for pinyon and juniper species. Based on recent periodic inventory data from Arizona (O’Brien 2002), New Mexico (O’Brien 2003) and Utah (O’Brien 1999), annual mortality, on a volume basis, was estimated at 0.08–0.23% for common pinyon, 0.14% for singleleaf pinyon, 0.01% for oneseed ju- niper (Juniperus monosperma (Engelm.) Sarg.), 0.01–0.08% for Rocky Mountain juniper (Juniperus scopulorum Sarg.), and 0.01–0.07% for Utah juniper (Juniperus os- teosperma (Torr.) Little). In contrast, e.g., estimates of annual mortality for ponderosa pine (Pinus ponderosa Laws.) ranged from 0.21 to 0.48% in the same inventories. Be- cause these estimates were computed from periodic inventories conducted in relatively normal years (i.e., not excessively droughty), they may be representative of approximate “background” mortality rates. These esti- Figure 3. County-level estimates of pinyon mortality 2000–2004. Mortality values represent mates also include mortality due to fire, so the percentage of mortality of all pinyon trees 5.0 in. DBH and greater (live and mortality), background mortality rates excluding fire on a basal area basis and on plots classified as the pinyon-juniper woodland type and are actually somewhat lower. excludes mortality attributable to fire and logging. Annual inventory was implemented in Basing mortality estimates on a 5-year Utah in 2000, Arizona in 2001, and Colorado in 2002.
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